Measurements of photoionization cross sections from the 4p, 5d and 7s excited states of potassium |
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Authors: | Nasir Amin S. Mahmood S.U. Haq M. Rafiq |
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Affiliation: | a Atomic and Molecular Physics Laboratory, Department of Physics, Quaid-i-Azam University, Islamabad 45320, Pakistan b Department of Physics, University of Agriculture, Faisalabad, Pakistan c Department of Physics, UAJ&K, Muzaffarabad, Pakistan |
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Abstract: | New measurements of the photoionization cross sections from the 4p 2P1/2,3/2, 5d 2D5/2,3/2 and 7s 2S1/2 excited states of potassium are presented. The cross sections have been measured by two-step excitation and ionization using a Nd:YAG laser in conjunction with a thermionic diode ion detector. By applying the saturation technique, the absolute values of the cross sections from the 4p 2P3/2 and 4p 2P1/2 states at 355 nm are determined as 7.2±1.1 and 5.6±0.8 Mb, respectively. The photoionization cross section from the 5d 2D5/2,3/2 excited state has been measured using two excitation paths, two-step excitation and two-photon excitation from the ground state. The measured values of the cross sections from the 5d 2D5/2 state by two-photon excitation from the ground state is 28.9±4.3 Mb, whereas in the two-step excitation, the cross section from the 5d 2D3/2 state via the 4p 2P1/2 state and from the 5d 2D5/2,3/2 states via the 4p 2P3/2 state are determined as 25.1±3.8 and 30.2±4.5 Mb, respectively. Besides, we have measured the photoionization cross sections from the 7s 2S1/2 excited state using the two-photon excitation from the ground state as 0.61±0.09 Mb. |
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Keywords: | 32.30.Jc 32.80.Rm |
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